Why didn’t it just burn them to death with its breath weapon?
They didn't make this super-clear, but it was because it couldn't get it to ignite. It was clicking like kitchen stove and you could see the sparks but the breath wasn't burning.
How did they escape from the dragon? That was confusing.
So it pumped gas into the cavern/room trying to burn them, and they hid under the water and got Simon to use a cantrip to ignite the gas causing an explosion. They somehow knew they were near the surface.
Holga was killing and maiming the guards. Basically the cops. Who are good guys. The ones in the forge who caught the sneaking in/breaking the law. Yikes?
No-one else thinks it's "yikes".
A) ACAB - super applies to city guards in D&D.
B) City guard are inevitably corrupt and working for a corrupt institution*. We
know these guys are - they dragged people away for a back-alley execution with no trial, no justice, nothing, just murder - so they're people who are willing to commit or look away from the commission of murder. They're thus at best morally equal to a gang. Arguably worse because they pretend to be part of the justice system. Oh and they were also knowingly involved in the theft of all the money (which y'know, a lot less bad, but still makes them criminals-in-uniforms), both moving it around and putting it on the boat.
C) This is just how D&D works.
Were the cartoon characters killed? They were in the maze when the red mist hit.
At least some of them, yes. But they weren't the actual characters, just dressed like them.
Doric needed more screen time.
Indeed - though it was a fairly packed movie she noticeably got the short end of it.
Also, she can cast spells. She does in the book. Edgin never does even in his book.
Yeah this is though I think something difficult for audiences, because it's really a contrivance in D&D, and if virtually everyone is finger-wiggling wizards it gives things a very different tone. So I respect that they avoided this.
* = Even with
Guards, Guards, part of the joke/conceit is that it's
surprising that they're not corrupt, and that Vimes is so upright despite his poverty. But they're working for a corrupt and murderous totalitarian dictator and enforcing unjust laws (albeit they try not to when it's genuinely unjust).